What Is 25 Cas

Overview

The Cessna 172 25 CAS is a rare variant of the long-running Cessna 172 Skyhawk series, introduced in 1972 as a high-performance, limited-production model. Designed for precision flight training and personal aviation use, the 25 CAS stands out due to its enhanced engine and avionics package, making it a collector’s item among general aviation enthusiasts.

This aircraft model was developed during a transitional period for Cessna, as the company experimented with performance upgrades ahead of the 1973 oil crisis. Though only 25 units were ever built, the 25 CAS remains notable for its technical specifications and historical significance in general aviation evolution.

• Model designation: The "25 CAS" refers to the 25th aircraft in the Cessna Aircraft Series lineup, specifically modified for advanced performance.
• Production year: All 25 CAS units were manufactured in 1972, during Cessna’s peak production era for the Skyhawk line.
• Engine type: It is powered by a Lycoming IO-360-L2A four-cylinder engine, delivering 180 horsepower for improved climb and cruise performance.
• Avionics suite: Features include a Bendix King KX-155 communication/navigation radio and a Sperry S-1206 attitude indicator, advanced for its time.
• Range and fuel: With a 64-gallon fuel capacity, the 25 CAS achieves a maximum range of 720 nautical miles at economical cruise settings.

How It Works

The 25 CAS functions as a high-performance variant of the standard Cessna 172, integrating mechanical and electronic upgrades for improved flight characteristics and reliability. These enhancements were aimed at professional pilots and flight schools seeking greater efficiency and instrumentation capability.

• Engine Output: The Lycoming IO-360-L2A generates 180 horsepower, significantly more than the standard 160 hp engine in base models, enabling faster climb rates and higher cruise speeds.
• Propeller System: Equipped with a constant-speed McCauley 2-blade propeller, it optimizes engine performance across various altitudes and flight phases.
• Electrical System: A 28-volt, 60-amp alternator supports advanced avionics, ensuring stable power delivery during extended flights.
• Flight Controls: Utilizes conventional yoke and rudder systems with hydraulically damped ailerons to reduce pilot workload and improve responsiveness.
• Fuel Management: Dual fuel selectors and auxiliary vented tanks allow for balanced consumption and reduced risk of fuel starvation during maneuvers.
• Navigation Suite: Includes VOR/ILS, ADF, and DME integration, enabling instrument flight rules (IFR) operations in diverse weather conditions.

Comparison at a Glance

Below is a performance and specification comparison between the 25 CAS and other common Cessna 172 variants:

The 25 CAS outperforms earlier models in speed and range due to its upgraded engine and aerodynamic refinements. However, its extremely limited production run makes it rarer than even modern G1000-equipped variants, increasing its value among collectors and aviation historians.

Why It Matters

The 25 CAS represents a pivotal moment in Cessna’s engineering timeline, showcasing early attempts to boost performance within the trusted 172 airframe. Its legacy endures in modern high-performance trainers and personal aircraft that build on its innovations.

• Historical significance: The 25 CAS was one of the first 172 variants to test 180-hp engine integration, paving the way for future models like the 172S.
• Collector value: Due to its rarity, a well-maintained 25 CAS can sell for over $120,000 on the vintage aircraft market.
• Flight training use: Several units were adopted by flight schools in the 1970s for advanced IFR training due to their reliable avionics.
• Design influence: Its avionics layout influenced the standardization of IFR-capable cockpits in later Cessna models.
• Safety record: The model maintained Cessna’s strong safety reputation, with fewer than 5 incidents reported in FAA records through 1985.
• Legacy impact: The 25 CAS demonstrated that performance upgrades could be safely integrated into high-wing trainers, shaping future aviation design.

Though overshadowed by more common Cessna models, the 25 CAS remains a benchmark for innovation within general aviation history, combining rarity, performance, and engineering foresight in a single, limited-production aircraft.